CN210178479U

CN210178479U - Piston

Info

Publication number: CN210178479U
Application number: CN201920719756.XU
Authority: CN
Inventors: Zhiyan Huang; 黄志艳; Huan Yu; 于桓; Qingya Tan; 谭清雅; Junyao Meng; 孟俊尧
Original assignee: Hunan Jiangbin Machinery Group Co Ltd
Current assignee: Hunan Jiangbin Machinery Group Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-03-24
Anticipated expiration: 2029-05-17

Abstract

The utility model discloses a piston, including skirt portion, skirt portion is provided with the face window structure that is used for making the grease backward flow and is used for and round pin axle complex pinhole, and the position that lies in pinhole upper portion in the face window structure is provided with the oil storage recess that is used for storing the grease. In the using process, the grease can be stored in the oil storage groove in the process of flowing through the face window structure, and the grease stored in the oil storage groove can flow out in the process of moving the piston, so that continuous lubrication is provided for the pin hole and the pin shaft; because the oil storage groove is positioned at the upper part of the pin hole, the oil in the oil storage groove can flow through the pin hole in the flowing process, so that a lubricating oil film is continuously formed on the surface of the pin hole, the abnormal abrasion of the pin hole is reduced, and the risk of locking the pin hole is avoided.

Description

Piston

Technical Field

The utility model relates to the technical field of engines, more specifically say, relate to a piston.

Background

In order to enable lubricating oil to smoothly flow back to an oil pan, a face window structure 1 is generally arranged on a piston, the face window structure 1 in the prior art cannot store oil, only oil scraped by a three-ring groove flows back to the oil pan, and only a small part of the oil can enter a pin hole 2 of the piston; under the working conditions of high speed, high temperature and high detonation pressure of the piston, an oil film formed by the piston pin and the pin hole 2 is easily damaged, so that the fault of abnormal abrasion or locking of the pin hole 2 is caused, and meanwhile, the service life of the piston is also shortened.

In summary, how to avoid locking of the piston pin hole 2 is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a piston, which can avoid the locking phenomenon of the pin hole.

In order to achieve the above object, the present invention provides the following technical solutions:

the piston comprises a piston skirt portion, wherein the piston skirt portion is provided with a face window structure used for enabling grease to flow back and a pin hole used for being matched with a pin shaft, and an oil storage groove used for storing the grease is formed in the position of the upper portion of the pin hole in the face window structure.

Preferably, the oil storage groove is arranged right above the pin hole, and the oil storage groove is symmetrically arranged about the central axis of the cross section of the pin hole;

the cross section is perpendicular to the section of pinhole length direction, the central axis is for passing through in the cross section the perpendicular of the centre of a circle of pinhole.

Preferably, the bottom surface of the oil storage groove is an arc surface, and the opening edge of the oil storage groove is an arc transition surface.

Preferably, the size of the oil storage groove in the width direction of the face-window structure is greater than or equal to the diameter of the pin hole.

Preferably, the oil storage groove is of an arc structure with the middle part arched upwards.

Preferably, the face window structure including the symmetry set up in first face window structure and the second face window structure at pinhole length direction both ends, the oil storage recess including the symmetry set up in first oil storage recess and the second oil storage recess at pinhole length direction both ends.

The utility model provides a piston, including skirt portion, skirt portion is provided with the face window structure that is used for making the grease backward flow and is used for and round pin axle complex pinhole, and the position that lies in pinhole upper portion in the face window structure is provided with the oil storage recess that is used for storing the grease.

In the using process, the grease can be stored in the oil storage groove in the process of flowing through the face window structure, and the grease stored in the oil storage groove can flow out in the process of moving the piston, so that continuous lubrication is provided for the pin hole and the pin shaft; because the oil storage groove is positioned at the upper part of the pin hole, the oil in the oil storage groove can flow through the pin hole in the flowing process, so that a lubricating oil film is continuously formed on the surface of the pin hole, the abnormal abrasion of the pin hole is reduced, and the risk of locking the pin hole is avoided.

In addition, the piston pin seat can be cooled in the process that grease in the oil storage groove flows out, the heat load at the piston pin seat is reduced, the reliability of the piston pin hole is improved, and the service life of the piston is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a prior art face window construction;

fig. 2 is a schematic structural diagram of a first embodiment of a piston according to the present invention;

fig. 3 is a schematic structural view of an oil storage groove.

In FIGS. 1-3:

1 is a face window structure, 11 is an oil storage groove, and 2 is a pin hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a piston, can avoid the pinhole locking.

Referring to fig. 1-3, fig. 1 is a schematic view of a prior art front window structure; fig. 2 is a schematic structural diagram of a first embodiment of a piston according to the present invention; fig. 3 is a schematic structural view of an oil storage groove.

The piston that this embodiment provided includes piston skirt portion, and piston skirt portion is provided with the face window structure 1 that is used for making the grease backward flow and is used for and round pin axle complex pinhole 2, and the position that lies in pinhole 2 upper portion in the face window structure 1 is provided with the oil storage recess 11 that is used for storing the grease.

It should be noted that the depth of the oil storage groove 11 needs to be ensured that the overall strength and rigidity of the piston are not affected, and the specific depth of the oil storage groove 11 needs to be determined according to actual conditions; the shape of the reservoir groove 11 may be rectangular, circular, or other shapes.

In the using process, the grease can be stored in the oil storage groove 11 in the process of flowing through the face window structure 1, and the grease stored in the oil storage groove 11 can flow out in the process of piston movement, so that continuous lubrication is provided for the pin hole 2 and the pin shaft; because the oil storage groove 11 is positioned at the upper part of the pin hole 2, the oil in the oil storage groove 11 flows through the pin hole 2 in the flowing process, so that a lubricating oil film is continuously formed on the surface of the pin hole 2, the abnormal abrasion of the pin hole 2 is reduced, and the risk of locking the pin hole 2 is avoided.

In addition, the piston pin seat can be cooled in the process that grease in the oil storage groove 11 flows out, the heat load at the piston pin seat is reduced, the reliability of the piston pin hole 2 is improved, and the service life of the piston is prolonged.

It should be noted that, as shown in fig. 1, the face window structure 1 is an oil return passage which is arranged at the piston skirt and is about 0.5 to 1.5mm lower than the outer circle of the skirt, and is mainly used for enabling lubricating grease to smoothly flow back to the oil pan, so that the opening of the oil storage groove 11 faces the outer side of the piston skirt in the circumferential direction; the pin hole 2 is a structure provided in a skirt portion of the piston for mounting a pin shaft, the pin shaft is used for connecting with a connecting rod, and as shown in fig. 2, the piston is penetrated in the length direction of the pin hole 2.

On the basis of the above embodiment, in order to make more grease in the oil storing groove 11 flow into the pin hole 2, the oil storing groove 11 may be disposed right above the pin hole 2, and the oil storing groove 11 may be disposed symmetrically with respect to the central axis of the cross section of the pin hole 2; the cross section is a section perpendicular to the length direction of the pin hole 2, and the central axis is a perpendicular line passing through the center of the pin hole 2 in the cross section.

In the actual use process, a corresponding pin shaft is installed in the pin hole 2, the pin shaft generally extends out of the end face of the pin hole 2 by a certain length, the oil storage groove 11 is formed right above the pin hole 2, when the grease flows out, the probability of the grease passing through the pin shaft is increased, the grease flows to the pin shaft and then flows into the pin hole 2 along the pin shaft, so that an oil film is formed on the surface of the pin hole 2, and meanwhile, the pin shaft and the pin hole 2 are prevented from being abraded due to insufficient lubrication.

It should be noted that the number of the oil storage grooves 11 may be 1, 2, 3, or multiple, which is determined according to the actual situation and is not described herein again.

On the basis of the above embodiment, in order to avoid stress concentration and enable grease to flow out smoothly, the bottom surface of the oil storage groove 11 may be set to be an arc surface, and the opening edge of the oil storage groove 11 may be an arc transition surface.

In the using process, the existence of the arc surface and the arc transition surface can make the process of grease flowing out smoother.

Preferably, the opening size of the oil storage groove 11 can be larger than the size of the bottom surface, so that the oil can flow out conveniently while the processing is facilitated.

In addition to the above-described embodiments, in order to obtain sufficient grease in the circumferential direction of the pin hole 2, the dimension of the oil reservoir groove 11 in the width direction of the window structure 1 may be made larger than or equal to the diameter of the pin hole 2.

Note that, as shown in fig. 3, the width direction of the window structure 1 is the width direction of the angle shown in fig. 3.

In the using process, because the length of the oil storage groove 11 is larger than the diameter of the pin hole 2, and the oil storage groove 11 is positioned right above the pin hole 2, the grease flowing out of the oil storage groove 11 can cover the whole circumferential area of the pin hole 2, so that the pin hole 2 is fully lubricated by the grease.

On the basis of the above-described embodiment, in order to increase the oil storage volume of the oil storage groove 11 as much as possible in a limited space, the oil storage groove 11 may be provided in an arc structure that is arched upward in the middle.

Preferably, the bending radian of the arc-shaped structure is matched with that of the pin hole 2; in order to secure the rigidity of the pin hole 2, the oil reservoir groove 11 is not generally communicated with the pin hole 2.

On the basis of the above embodiment, the face-window structure 1 may include a first face-window structure and a second face-window structure symmetrically disposed at both ends of the pin hole 2 in the length direction, and the oil storage groove 11 includes a first oil storage groove and a second oil storage groove symmetrically disposed at both ends of the pin hole 2 in the length direction.

It should be noted that the first oil storage groove may include at least one oil storage groove unit, and the second oil storage groove may also include at least one oil storage groove unit, which is determined according to actual situations, and is not described herein again.

It should be further noted that the first oil storage groove and the second oil storage groove, and the first window structure and the second window structure mentioned in the present application are only for illustrating the difference of the positions, and are not sequentially distinguished.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The utility model provides an arbitrary compound mode of all embodiments all is in this utility model's a protection scope, does not do here and gives unnecessary details.

The piston provided by the utility model is described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A piston comprises a piston skirt part and is characterized in that the piston skirt part is provided with a face window structure (1) used for enabling grease to flow back and a pin hole (2) used for being matched with a pin shaft, and an oil storage groove (11) used for storing the grease is formed in the position, located at the upper part of the pin hole (2), in the face window structure (1);

and the grease in the oil storage groove (11) flows out to the pin hole (2) so that a lubricating oil film is continuously formed on the surface of the pin hole (2).

2. The piston according to claim 1, characterized in that the oil reservoir groove (11) is provided directly above the pin bore (2), and the oil reservoir groove (11) is provided symmetrically with respect to a central axis of a cross section of the pin bore (2);

the cross section is perpendicular to the section of pinhole (2) length direction, the central axis is the perpendicular line of passing through in the cross section the centre of a circle of pinhole (2).

3. The piston according to claim 2, characterized in that the bottom surface of the oil storage groove (11) is a circular arc surface, and the opening edge of the oil storage groove (11) is a circular arc transition surface.

4. The piston according to claim 3, characterized in that the dimension of the oil reservoir groove (11) in the width direction of the face window structure (1) is greater than or equal to the diameter of the pin hole (2).

5. The piston according to claim 4, characterized in that the oil storage groove (11) is of an arc structure with a middle part arched upwards.

6. The piston according to any one of claims 1 to 5, wherein the window structure (1) comprises a first window structure and a second window structure which are symmetrically arranged at both ends of the pin hole (2) in the length direction, and the oil storage groove (11) comprises a first oil storage groove and a second oil storage groove which are symmetrically arranged at both ends of the pin hole (2) in the length direction.